LIFTING MECHANISM HYDRAULIC DRIVE Russian patent published in 1999 - IPC

FIELD: hydraulic drives for heavy-duty lifting machines and mechanisms. SUBSTANCE: hydraulic drive has hydraulic gate whose control cavity is in communication with raising manifold between hydraulic gate and hydraulic pressure valve with return valve positioned between distributor, mounted at inlet ends of hydraulic pressure and discharge pipelines, and hydraulic gate mounted on rigid pipeline directly on hydraulic cylinders. Throttle-spray nozzle is disposed in pipeline for communicating hydraulic gate control cavity with lowering manifold and return valve is positioned in pipeline for communicating hydraulic gate control cavity with raising manifold. Outlet end of return valve is connected to manifold and inlet end is connected to hydraulic gate control cavity. Such construction eliminates spontaneous displacement of hydraulic cylinder rod under load upon breakage of any of manifolds communicated with cylinder cavities. Hydraulic drive circuit provides more efficient arrangement of controlled apparatuses disposed outside hydraulic cylinder motion path. EFFECT: increased efficiency by improved safety and optimum arrangement of parts of hydraulic drive. 2 cl, 1 dwg